Hello MusicalMemories

Yes, those systems are mostly designed to be played at home, but, I know that couple friends have taken those systems and played in a living room home, that is more or less adequate.

Usually if you are playing out most likely to be in larger places, and there are many different types of amplification, passive, active, and also depends on the venue/size of the room, acoustics, how many people you are playing, if it is for dancing, or just listening....etc..
If it is Yamaha arranger, I recommend use stereo amplification, that sounds much better, since Yamaha samples in stereo.

My 2 Cents

Manuel